1/30

36V Operation 600mA Synchronous Step-Down DC/DC Converters

Lx

PG

FB

GN D

EN/SS

C

IN

L

2.2μF

10μF×2

ETR05071-001a

■FEATURES

Input Voltage Range

:

3.0 ~ 36V (Absolute Max 40V

Output Voltage Range

:

1.0 ~ 25V

FB Voltage

:

0.75V ± 1.5%

Oscillation Frequency

:

1.2MHz, 2.2MHz

Output Current

:

600mA

Quiescent Current

:

12.5μA (1.2MHz)

:

13.5μA (2.2MHz)

Control Methods

:

PWM/PFM Auto

:

Efficiency 83%@12V→5V、1mA

Soft-start Time

:

Adjustable by RC

Protection Circuits

:

Over Current Protection

:

Thermal Shutdown

Output Capacitor

:

Ceramic Capacitor

Operating Ambient Temperature

:

- 40℃ ~ + 105℃

Packages

:

SOT-89-5 (Without Power Good)

:

USP-6C (With Power Good)

Environmentally Friendly

:

EU RoHS Compliant, Pb Free

■GENERAL DESCRIPTION

The XC9268 series are 36V operation synchronous step-down DC/DC converter ICs with a built-in P-channel MOS driver transistor

and N-channel MOS switching transistor. The XC9268 series has operating voltage range of 3.0V~36.0V and high-efficiency power

A 0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.0V to 25.0V using

1.2MHz or 2.2MHz can be selected for the switching frequency. In automatic PWM/PFM control, the IC operates by PFM control

when the load is light to achieve high efficiency over the full load range from light to heavy.

The soft-start time is internally set to 2.0ms (TYP.), but can be adjusted to set a longer time using an external resistor and capacitor.

With the built-in UVLO function, the driver transistor is forced OFF when input voltage becomes 2.7V or lower.

The output state can be monitored using the power good function.

Internal protection circuits include over current protection and thermal shutdown circuits to enable safe use.

■APPLICATIONS

● Electric Meter

● Gas Detector

● Various Sensor

● Industrial Equipment

● Home appliance

■TYPICAL APPLICATION CIRCUIT

■TYPICAL PERFORMANCE

CHARACTERISTICS